Thermoformable multilayer polymeric film
AssigneePechiney Emballage Flexible Europe
InventorsMary E. Shepard, Robert J. Blemberg, Scott W. Middleton, Jerry F. Jesse
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Abstract
A clear, multilayer polymeric film that is desirable for thermoforming applications. The film in its various embodiments include two inner layers of nylon and/or a core layer of ethylene vinyl alcohol or ethylene vinyl alcohol copolymer sandwiched between the two inner nylon layers. The film also has an outer layer of a heat sealable polymer and may also have an outer layer of nylon. The film is coextruded, blown into a tubular shape, oriented, and cooled by the method of tubular water quenching. The film has various improved physical properties over the prior art, including properties of “memory”, clarity, gloss and low haze.
Claims32
A thermoformable multilayer polymeric film, said film comprising:
- (a) a first core layer, said first core layer comprising EVOH;
- (b) second hand third layers, each of said second and third layers disposed in contact with said first core layer, each of said second and third layers comprising a nylon;
- (c) a fourth layer of an adhesive, said fourth layer disposed in contact with said second layer;
- (d) a fifth layer of an adhesive, said fifth layer disposed in contact with said third layer;
- (e) a sixth layer comprising a nylon, said sixth layer disposed in contact with said fourth layer;
- and
- (f) a seventh layer, said seventh layer disposed in contact with said fifth layer said seventh layer comprising a polymer selected from the group consisting of EVA, LLDPE, EMA, EAA, and EMAA.
A thermoformable, multilayer polymeric film, said film comprising:
- (a) first and second layers, each of said first and second layers comprising nylon;
- (b) a third layer, said third layer comprising an adhesive, said third layer disposed between and in contact with each of said first and second layers;
- (c) a fourth layer, said fourth layer comprising an adhesive, said fourth layer disposed in contact with said first layer;
- (d) a fifth layer, said fifth layer comprising an adhesive, said fifth layer disposed in contact with said second layer;
- (e) a sixth layer, said sixth layer comprising nylon, said sixth layer disposed in contact with said second layer;
- (f) a seventh layer, said seventh layer comprising a polymer selected from the group consisting of LLDPE, LDPE, EVA, EAA, EMAA, EMA, or an ionomer, said seventh layer disposed in contact with said fifth layer.
A thermoformable multilayer polymeric film, said film comprising:
- (a) a first core layer, said first core layer comprising EVOH;
- (b) a second layer comprising nylon, said second layer disposed in contact with said first core layer;
- (c) a third layer comprising nylon, said third layer disposed in contact with said first core layer;
- (d) a fourth layer comprising nylon, said fourth layer disposed in contact with second layer;
- (e) a fifth layer of an adhesive, said fifth layer disposed in contact with said third layer;
- (f) a sixth layer comprising an ionomer, said sixth layer disposed in contact with said fifth layer;
- and
- (g) a seventh layer comprising a polymer selected from the group consisting of LLDPE, LDPE, EVA, EAA, EMAA, or an ionomer, said seventh layer disposed in contact with said sixth layer.
A thermoformable multilayer polymeric film, said film comprising:
- (a) a first core layer, said first core layer comprising EVOH;
- (b) a second layer comprising nylon, said second layer disposed in contact with said first core layer;
- (c) a third layer comprising nylon, said third layer disposed in contact with said first core layer;
- (d) a fourth layer comprising an adhesive, said fourth layer disposed in contact with said second layer;
- (e) a fifth layer comprising an adhesive, said fifth layer disposed in contact with said third layer;
- (f) a sixth layer comprising a polymer selected from the group consisting of MDPE, LLDPE, EVA, and styrene, said sixth layer disposed in contact with said fourth layer;
- and
- (g) a seventh layer, said seventh layer comprising a polymer selected from the group consisting of EVA, LLDPE, EMA, EAA, EMAA and an ionomer, said seventh layer disposed in contact with said fifth layer.
A thermoformable multilayer polymeric film, said film comprising:
- (a) a first core layer, said first core layer comprising EVOH;
- (b) second and third layers, each of said second and third layers disposed in contact with said first core layer, each of said second and third layers comprising a nylon;
- (c) a fourth layer of an adhesive, said fourth layer disposed in contact with said second layer;
- (d) a fifth layer, said fifth layer comprising an anhydride grafted polyolefin, said fifth layer disposed in contact with said third layer;
- (e) a sixth layer, said sixth layer comprising a polyolefin, said sixth layer disposed in contact with said fourth layer;
- and
- (f) a seventh layer, said seventh layer comprising a heat sealable polymer, said seventh layer disposed in contact with said sixth layer.
A method of making a thermoformable multilayer polymeric film, said method comprising in order:
- (a) coextruding a multilayer polymeric film;
- (b) inflating said film to create a bubble;
- (c) cooling said bubble by application of air as it is coextruded at a first position;
- (d) cooling said bubble by application of water at a second position;
- (e) collapsing said bubble;
- and
- (f) winding said bubble at a third position to produce a finished roll.
Dependencies are inferred from the claim text.